Abstract
Effects of radial electric field on scrape-off layer (SOL) plasma and sheath formation are studied by the use of a particle simulation code PARASOL. Previous theory for the magnetic presheath is confirmed by the simulation. The flow pattern and the density profile in the SOL plasma become asymmetric due to the Er × B drift. The condition of the sheath formation is clarified; at the sheath entrance, the flow velocity normal to the diverto plate is larger than a specific sound speed projected in the normal direction. The asymmetry of the SOL plasma is principally brought by this boundary condition. The asymmetry becomes large with the increase of Er × B drift velocity. When the velocity exceeds a critical value, the detached divertor with very low density is formed in a divertor region where Er × B drift flows out from the plate.
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